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Sponsorship lets you absorb deposit fees so your users receive the full deposited amount on the target chain. You configure each fee type independently per source chain with POST /setup.

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Sponsorable fees

Each fee type is controlled independently:

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Configure sponsorship

Sponsorship is configured per source chain using CAIP-2 identifiers. Each chain is configured independently — there’s no global toggle. Chains without explicit config default to no sponsorship.
To clear all sponsorship rules, send sponsorship: {} in a partial POST /setup update.

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How sponsorship is resolved

Each fee type is resolved independently when processing a deposit, based on the source chain config and the account’s deployment status at that moment.
  • Each fee type is resolved independently. You can sponsor bridging without sponsoring gas, or vice versa.
  • Deployment status is checked at processing time, not at registration. An account registered before deployment will start receiving gas sponsorship once it’s deployed (if the mode is "deployed").
  • Chains without explicit config default to no sponsorship. Omitting a fee type from the chain config is equivalent to "none".

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Effect on deposit amount

Sponsored fees are covered by your organization’s sponsorship and billed to you monthly. The user receives the full bridged amount — if they deposit 100 USDC and fees are 0.50 USDC, they receive the full 100 USDC on the target chain. Unsponsored fees are deducted from the deposit. The user receives less than they sent — if they deposit 100 USDC and fees are 0.50 USDC, they receive 99.50 USDC.

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